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  2. List of the largest fast food restaurant chains - Wikipedia

    en.wikipedia.org/wiki/List_of_the_largest_fast...

    Country of origin Name Number of locations Revenue 1 China Mixue Ice Cream & Tea: 45,000 (2024) [1]: 168 RMB13.6 billion (2021) [1]: 247 : 2 United States McDonald's ...

  3. Analysis of water chemistry - Wikipedia

    en.wikipedia.org/wiki/Analysis_of_water_chemistry

    Water chemistry analysis is often the groundwork of studies of water quality, pollution, hydrology and geothermal waters. Analytical methods routinely used can detect and measure all the natural elements and their inorganic compounds and a very wide range of organic chemical species using methods such as gas chromatography and mass spectrometry .

  4. Water testing - Wikipedia

    en.wikipedia.org/wiki/Water_testing

    The [[World Water Monitoring [36] Day|EarthEcho Water Challenge]] is an international education and outreach program that generates public awareness and involvement in safeguarding water resources globally by engaging citizens to conduct water testing of local water bodies. Participants learn how to conduct simple water quality tests, analyze ...

  5. Water quality - Wikipedia

    en.wikipedia.org/wiki/Water_quality

    The sampler must determine if a single time and location meets the needs of the investigation, or if the water use of interest can be satisfactorily assessed by averaged values of sampling over time and location, or if critical maxima and minima require individual measurements over a range of times, locations or events. The sample collection ...

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  7. Nutrition analysis - Wikipedia

    en.wikipedia.org/wiki/Nutrition_analysis

    Traditionally, food companies would send food samples to laboratories for physical testing. Typical analyses include: moisture (water) by loss of mass at 102 °C; protein by analysis of total nitrogen, either by Dumas or Kjeldahl methods; total fat, traditionally by a solvent extraction, but often now by secondary methods such as NMR

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